condition mean min max ZT0-3 52.8 52.8 52.8 ZT4-7 58.4 58.4 58.4 ZT8-11 26.75 26.75 26.75 ZT12-15 52.25 52.25 52.25 ZT16-19 30.85 30.85 30.85 ZT20-23 31.85 31.85 31.85